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Stockholders' Equity (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jan. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |
Common Stock, Shares Authorized |  | 62,500,000 |  | 62,500,000 |  |  |
Preferred Stock, Shares Authorized |  | 2,000,000 |  | 2,000,000 |  |  |
Share-Based Compensation |  |  |  | $ 219,000 | $ 330,000 |  |
Proceeds From Issuance Or Sale Of Equity |  |  |  | $ 8,667,000 | 0 |  |
Class of Warrant or Right, Expired |  | 345,000 |  | 345,000 |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |  | 5.00 |  | 5.00 |  |  |
Underwritten Public Offering [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 9,600,000 |  |  |
Proceeds From Issuance Or Sale Of Equity |  |  |  | $ 8,700,000 |  |  |
Right Offering [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants Authorized For Issuance To Acquire Common Stock Shares Number |  |  |  | 2,395,471 |  |  |
Stock Issued During Period, Shares, Other |  |  |  | 2,395,471 |  |  |
Shares Issued, Price Per Share |  |  |  |  |  | $ 4.00 |
Consultant Plan [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 142,359 |  | 142,359 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 10,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  | $ 4.85 |  |  |
Shares Reserved Unissued |  | 104,149 |  | 104,149 |  |  |
Stock Option Plan Description |  |  |  | The Consultant Plan provides for quarterly increases in the available number of authorized shares equal to the lesser of 1% of any new shares issued by the Company during the quarter immediately prior to the adjustment date or such lesser amount as the Board of Directors shall determine. |  |  |
Share Based Compensation Arrangement by Share Based Payment Award Options Grants In Period Fair Value |  |  |  | $ 49,000 |  |  |
Consultant Plan Expenses |  | $ 12,000 | $ 10,000 | $ 24,000 | 20,000 |  |
Warrant [Member] | Right Offering and Public Offering [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date |  |  |  | Jan. 25, 2019 |  |  |
Equity Incentive Plan [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Purchase Price Share Minimum |  |  |  | 85.00% |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 1,657,732 |  | 1,657,732 |  |  |
Increase Decrease Of Share Based Compensation Arrangement By Share Based Payment Award Percentage |  |  |  | 10.00% |  |  |
Share-based Compensation Outstanding - Reserved but unissued shares under the Plan |  | 980,210 |  | 980,210 |  |  | 882,815
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |  | $ 640,000 |  | $ 640,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 107,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 3.80 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term2 |  | 10 years |  |  |  |  |
Share-Based Compensation |  | $ 76,000 | $ 200,000 | $ 219,000 | $ 405,000 |  |
Shares Reserved Unissued |  | 200,508 |  | 200,508 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years 8 months 12 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number |  | 693,904 |  | 693,904 |  |  | 547,532
Stock Granted During Period, Value, Share-Based Compensation, Gross |  | $ 224,000 |  |  |  |  |
Allocated Share-based Compensation Expense |  | $ 14,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period1 |  | 4 years |  |  |  |  |
Equity Incentive Plan [Member] | Director [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |  | $ 150,000 |  | $ 150,000 |  |  |
MDB Consulting Services [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Underwriting Expense |  |  |  | 915,000 |  |  |
Payments for Underwriting Expense |  |  |  | 575,000 |  |  |
Other Underwriting Expense |  |  |  | $ 60,000 |  |  |

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